SIZE OF SUBSTRATE: Substrates vary widely in terms of size - everything from sands consisting of very tiny particles to larger river rocks. Large particle substrates allow more uneaten food and waste to penetrate into it leading to toxic build ups if not cleaned. Small particle substrates can compact which may lead to areas that lack oxygen. These areas can eventually release hydrogen sulfide - a substance that is extremely toxic to fish. The size of the particles also has a big impact on the health of the fish and the ease of cleaning. For instance, some fish like to scoop the substrate in their mouth and move it around. It is not a good idea to mix these species with sand because the small particles can irritate them. Sand can also be somewhat difficult to clean as the small particles often get vacuumed out of the tank along with the waste. On the other hand, some fish enjoy making nests or homes out of the substrate and in these instances, large particle sizes would not be conducive to this habit. As you can see, it is important to research the specific needs of your fish when considering the appropriate particle size.

CaribSea Aquatics 36890 Super Naturals River of Doubt Gravel, 20 lb

Create a supernatural experience by re-creating the natural world in your home. Super Naturals river series are a dramatic departure from the ordinary, with colorful mixed grades reminiscent of your favorite river Trails.

CNZ Aquarium Natural River Gravel

Manufacturer: CNZ
Brand: CNZ
Model: CNZSS30

Beautify your aquarium with CNZ aquarium natural river gravel. Aquarium gravel provides a surface for beneficial bacteria to grow. These bacteria feed on fish waste and help keep your aquarium clean. It might seem counter-intuitive, but you need good bacteria for your aquarium to thrive. These bacteria feed on fish waste cleaning your tank naturally. Consequently, you won't have to scoop out fish waste as frequently.

Seachem Fluorite Black Sand Substrate, 15.4lb Total (Two 7.7lb Bags)

Manufacturer: Seachem
Brand: Seachem

Seachem Flourite Black Sand Substrate Seachem Flourite Black Sand Substrate is ideal for natural planted aquariums.This sand is highly effective when used alone, but you can consider mixing it with gravels. There is no need for gravel modifiers such as laterite. It doesn't have any sort of chemical coating. The appearance of this sand is ideally suited for aquaria plants, but you can use for aquarium environment. Product Features: Ideal for natural planted aquarium. This sand is effective when it is left alone. It does not have any chemical coating. Item Specifications:

SIZE OF SUBSTRATE: Substrates vary widely in terms of size - everything from sands consisting of very tiny particles to larger river rocks. Large particle substrates allow more uneaten food and waste to penetrate into it leading to toxic build ups if not cleaned. Small particle substrates can compact which may lead to areas that lack oxygen. These areas can eventually release hydrogen sulfide - a substance that is extremely toxic to fish. The size of the particles also has a big impact on the health of the fish and the ease of cleaning. For instance, some fish like to scoop the substrate in their mouth and move it around. It is not a good idea to mix these species with sand because the small particles can irritate them. Sand can also be somewhat difficult to clean as the small particles often get vacuumed out of the tank along with the waste. On the other hand, some fish enjoy making nests or homes out of the substrate and in these instances, large particle sizes would not be conducive to this habit. As you can see, it is important to research the specific needs of your fish when considering the appropriate particle size.

SIZE OF SUBSTRATE: Substrates vary widely in terms of size - everything from sands consisting of very tiny particles to larger river rocks. Large particle substrates allow more uneaten food and waste to penetrate into it leading to toxic build ups if not cleaned. Small particle substrates can compact which may lead to areas that lack oxygen. These areas can eventually release hydrogen sulfide - a substance that is extremely toxic to fish. The size of the particles also has a big impact on the health of the fish and the ease of cleaning. For instance, some fish like to scoop the substrate in their mouth and move it around. It is not a good idea to mix these species with sand because the small particles can irritate them. Sand can also be somewhat difficult to clean as the small particles often get vacuumed out of the tank along with the waste. On the other hand, some fish enjoy making nests or homes out of the substrate and in these instances, large particle sizes would not be conducive to this habit. As you can see, it is important to research the specific needs of your fish when considering the appropriate particle size.

SIZE OF SUBSTRATE: Substrates vary widely in terms of size - everything from sands consisting of very tiny particles to larger river rocks. Large particle substrates allow more uneaten food and waste to penetrate into it leading to toxic build ups if not cleaned. Small particle substrates can compact which may lead to areas that lack oxygen. These areas can eventually release hydrogen sulfide - a substance that is extremely toxic to fish. The size of the particles also has a big impact on the health of the fish and the ease of cleaning. For instance, some fish like to scoop the substrate in their mouth and move it around. It is not a good idea to mix these species with sand because the small particles can irritate them. Sand can also be somewhat difficult to clean as the small particles often get vacuumed out of the tank along with the waste. On the other hand, some fish enjoy making nests or homes out of the substrate and in these instances, large particle sizes would not be conducive to this habit. As you can see, it is important to research the specific needs of your fish when considering the appropriate particle size.